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lammps/lib/gpu/coul_long.cpp
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coul_long.cpp
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/***************************************************************************
coul_long.cpp
-------------------
Axel Kohlmeyer (Temple)
Class for acceleration of the coul/long pair style.
__________________________________________________________________________
This file is part of the LAMMPS Accelerator Library (LAMMPS_AL)
__________________________________________________________________________
begin : July 2011
email : a.kohlmeyer@temple.edu
***************************************************************************/
#ifdef USE_OPENCL
#include "coul_long_cl.h"
#else
#include "coul_long_ptx.h"
#endif
#include "coul_long.h"
#include <cassert>
using namespace LAMMPS_AL;
#define CoulLongT CoulLong<numtyp, acctyp>
extern Device<PRECISION,ACC_PRECISION> pair_gpu_device;
template <class numtyp, class acctyp>
CoulLongT::CoulLong() : BaseCharge<numtyp,acctyp>(), _allocated(false) {
}
template <class numtyp, class acctyp>
CoulLongT::~CoulLong() {
clear();
}
template <class numtyp, class acctyp>
int CoulLongT::bytes_per_atom(const int max_nbors) const {
return this->bytes_per_atom_atomic(max_nbors);
}
template <class numtyp, class acctyp>
int CoulLongT::init(const int nlocal, const int nall, const int max_nbors,
const int maxspecial, const double cell_size,
const double gpu_split, FILE *_screen,
const double host_cut_coulsq, double *host_special_coul,
const double qqrd2e, const double g_ewald) {
int success;
success=this->init_atomic(nlocal,nall,max_nbors,maxspecial,cell_size,
gpu_split,_screen,coul_long);
if (success!=0)
return success;
// we don't have atom types for coulomb only,
// but go with the minimum so that we can use
// the same infrastructure as lj/cut/coul/long/gpu.
int lj_types=1;
shared_types=false;
int max_shared_types=this->device->max_shared_types();
if (lj_types<=max_shared_types && this->_block_size>=max_shared_types) {
lj_types=max_shared_types;
shared_types=true;
}
_lj_types=lj_types;
// Allocate a host write buffer for data initialization
UCL_H_Vec<numtyp> host_write(lj_types*lj_types*32,*(this->ucl_device),
UCL_WRITE_OPTIMIZED);
for (int i=0; i<lj_types*lj_types; i++)
host_write[i]=0.0;
lj1.alloc(lj_types*lj_types,*(this->ucl_device),UCL_READ_ONLY);
lj3.alloc(lj_types*lj_types,*(this->ucl_device),UCL_READ_ONLY);
sp_cl.alloc(4,*(this->ucl_device),UCL_READ_ONLY);
for (int i=0; i<4; i++) {
host_write[i]=host_special_coul[i];
}
ucl_copy(sp_cl,host_write,4,false);
_cut_coulsq=host_cut_coulsq;
_qqrd2e=qqrd2e;
_g_ewald=g_ewald;
_allocated=true;
this->_max_bytes=lj1.row_bytes()+lj3.row_bytes()+sp_cl.row_bytes();
return 0;
}
template <class numtyp, class acctyp>
void CoulLongT::clear() {
if (!_allocated)
return;
_allocated=false;
lj1.clear();
lj3.clear();
sp_cl.clear();
this->clear_atomic();
}
template <class numtyp, class acctyp>
double CoulLongT::host_memory_usage() const {
return this->host_memory_usage_atomic()+sizeof(CoulLong<numtyp,acctyp>);
}
// ---------------------------------------------------------------------------
// Calculate energies, forces, and torques
// ---------------------------------------------------------------------------
template <class numtyp, class acctyp>
void CoulLongT::loop(const bool _eflag, const bool _vflag) {
// Compute the block size and grid size to keep all cores busy
const int BX=this->block_size();
int eflag, vflag;
if (_eflag)
eflag=1;
else
eflag=0;
if (_vflag)
vflag=1;
else
vflag=0;
int GX=static_cast<int>(ceil(static_cast<double>(this->ans->inum())/
(BX/this->_threads_per_atom)));
int ainum=this->ans->inum();
int nbor_pitch=this->nbor->nbor_pitch();
this->time_pair.start();
if (shared_types) {
this->k_pair_fast.set_size(GX,BX);
this->k_pair_fast.run(&this->atom->dev_x.begin(), &lj1.begin(),
&lj3.begin(), &sp_cl.begin(),
&this->nbor->dev_nbor.begin(),
&this->_nbor_data->begin(),
&this->ans->dev_ans.begin(),
&this->ans->dev_engv.begin(), &eflag, &vflag,
&ainum, &nbor_pitch, &this->atom->dev_q.begin(),
&_cut_coulsq, &_qqrd2e, &_g_ewald,
&this->_threads_per_atom);
} else {
this->k_pair.set_size(GX,BX);
this->k_pair.run(&this->atom->dev_x.begin(), &lj1.begin(), &lj3.begin(),
&_lj_types, &sp_cl.begin(), &this->nbor->dev_nbor.begin(),
&this->_nbor_data->begin(), &this->ans->dev_ans.begin(),
&this->ans->dev_engv.begin(), &eflag, &vflag, &ainum,
&nbor_pitch, &this->atom->dev_q.begin(), &_cut_coulsq,
&_qqrd2e, &_g_ewald, &this->_threads_per_atom);
}
this->time_pair.stop();
}
template class CoulLong<PRECISION,ACC_PRECISION>;
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